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Read 2 lines from File, Run Command based off output

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http://www.unix.com – Okay, so I have a file containing line after line of three digit numbers. I need a script that does an action based on the last two numbers in this list. So.... To get the last two numbers, I can have the script do tail -2 filename.txt But where I run into trouble is as follows. If these last two numbers, retrieved via tail, are Greater than 400, I want to run a command. The command is irrelevant, so lets just make something up: touch filename.txt If it helps, it doesnt necessarily have to do > 400. It would still meet my needs if it did something more like. If = 400 or 401 (HowTos)

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Submitted by jiqi2 on 07/17/2012 – Made popular on 07/17/2012

Stories similar to Read 2 lines from File, Run Command based off output

Hi,

I have a value stored in x and I need to compare it to the numbers in every other line of a file. The file contains alternating lines of numbers and letters:

aaaa1111 AAAAAAAA bbbb2222 BBBBBBBB cccc3333 CCCCCCCC

I need to compare x to the numbers in every other line without the first four characters of that line. So I want to compare x to 1111, then to 2222, then 3333.

$ tail -f /logs/filename.log | awk '!(/list)'

I am able to run this command in GNU Linux flavour

But when I written in a script it is not working.

test.ksh:

variable="/logs/filename.log | awk '!(/list)'" tail -f $var

Getting the error as

tail: cannot open `|' for reading: No such file or directory tail: cannot open `grep' for reading: No such file or directory tail: cannot open `list' fo

If you have a look at this thread, you'll see that users have been posting the output a script which are numbers that range from 2 to 5 decimal places.

Coloring line numbers in less? 48 weeks 4 days ago

Please consider the following example:

$ grep --color=always -n 'Format\|Files' /usr/share/doc-base/doc-base | less -R

Here, grep will color also the line numbers of the matches, and less will display it.

I have a file with many numbers, with each number on one line.

Hi,.

I am writing a script to get the new files and split them.

Requirement Find the new files under the path "/wload/scmp/app/data/OAS" (There are 5 sub folders).

I have this simple script which redirects the output and append it to a file.

filename="/home/ronnie/tmp/hello"

date=$(date) echo "$date" >> $filename

Now, lets suppose I change date=$(date) to date= $(date) which will generate an error.

Log files are important when debugging or just to check how a system is performing, we usually use cat to list the log on the screen, but if we want to see a live view of the log file, the command is: tail -f /var/log/logfile.log

I have the following bash script lines in a file named test.sh.

Code: #!/bin/bash # # Write Date to cron.log # echo "Begin SSI Load $(date +%d%b%y_%T)" # # Get the latest rates file for processing. # d=$(ls -tr /rms/data/ssi | grep -v "processed" | tail -n 1) filename=$d export filename echo "The file name is $filename."

When I execute ./test.sh